Matlab exorcise

1. Sorting data is often necessary for many engineering and data analysis applications. For this assignment, you will write a custom function that sorts three numbers. Specifically, your function should take as its input argument a 1-D array of type double containing three elements. It should return the array with the elements sorted in order from smallest to largest. You may NOT use any built-in matlab functions (or loop keywords) to solve this; instead you must use decision making keywords and operators. Define an appropriate set of test cases that prove that your function always works for any set of real numbers in any order, and apply your function to those test cases.

This cannot be done using built in matlab functions. it needs to be completely custom. I don't even know where to start